<template>
    <div class="sidebar">
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#324157"
            text-color="#bfcbd9"
            active-text-color="#20a0ff"
            unique-opened
            router
        >
            <template v-for="item in menus">

                <template v-if="item.children">

                    <el-submenu :index="item.menuId" :key="item.menuId" :route="item.url">
                        <template slot="title">
                            <i :class="item.iconUrl"></i>
                            <span slot="title">{{ item.title }}</span>
                        </template>

                        <template v-for="subItem in item.children">
                            <el-submenu v-if="subItem.children" :index="subItem.menuId" :key="subItem.menuId" :route="subItem.url">

                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item
                                    @click="getMenuId(threeItem.menuId)"
                                    v-for="(threeItem, i) in subItem.children"
                                    :key="i"
                                    :index="threeItem.menuId"
                                    :route="threeItem.url"
                                    >{{ threeItem.title }}</el-menu-item
                                >

                            </el-submenu>
                            
                            <el-menu-item
                                v-else
                                :index="subItem.menuId"
                                :key="subItem.menuId"
                                :route="subItem.url"
                                @click="getMenuId(subItem.menuId)"
                                >{{ subItem.title }}</el-menu-item
                            >
                        </template>
                    </el-submenu>
                </template>

                <template v-else>

                    <el-menu-item :index="item.menuId" :key="item.index" :route="item.url">
                        <i :class="item.iconUrl"></i>
                        <span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from '../common/bus';
export default {
    data() {
        return {
            collapse: false,
            menus: [],
            onRoutes: ''
        };
    },
    // computed: {
    //     onRoutes() {
    //         console.log(this.$route)
    //         return this.$route.path.replace('/', '');
    //     }
    // },
    mounted() {
        this.menus = JSON.parse(sessionStorage.getItem('menuList'));
        this.onRoutes = sessionStorage.getItem('menuId');
    },
    methods: {
        getMenuId(id) {
            sessionStorage.setItem('menuId', id);
            this.onRoutes = id;
        }
    },
    created() {
        // 通过 Event Bus 进行组件间通信，来折叠侧边栏
        bus.$on('collapse', (msg) => {
            this.collapse = msg;
            bus.$emit('collapse-content', msg);
        });
    }
};
</script>

<style scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
}
.sidebar > ul {
    height: 100%;
    padding-bottom: 120px;
}
</style>
